Electric-arc lamp



(No Model.)

M. MAYER.

ELECTRIC ARC LAMP.

No. 527,211. Patented Oct. 9, 1894.

THE Nonms PETERS cu morauwa. WASHINGTON. mv c.

UNITED STATE-s PATENT OFFICE.

MAX MAYER, OF NEW YORK, N. Y., ASSIGN OR TO THE AUERBAOH- WOOLVERTON ELECTRIC COMPANY, OF NEW JERSEY.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 527,21 1, dated October 9, 1894. Application filed June 18,1894- Serial No. 514|840. (N0 modflli) To all whom it may concern; 7 I

Be it known that I, MAX MAYER, a citizen of the United States, residing in the city, county, and State of New York, have invented an Imthe following is a specification.

Efforts have heretofore been made to surround the carbons in arc lamps with a trans parent or translucent case substantially airtight for the purpose of excluding atmosphere and rendering the carbons more durable, and there have been openings in such case for allowing the accumulating gases to escape.

In my present improvement an inverted and suspended base is made use of to which the upper end of a hangingglass or transparent inclosure is connected substantially air-tight and the carbons approach each other in the form of an inverted pyramid, and the cores of the regulating magnets preferably pass through the inverted base so as to act upon the carbon holders in drawing the arc, but the helices of the electro-magnets are above the inverted base so as to be easy of access and also removed from the heat of the lamp, and in order to render the inclosure for for the lamp substantially air-tight, the cores of the electro-magnets slide in tubes that are closed at their upper ends so as to exclude the atmosphere as well as protect the sliding cores from dust or other foreign substances that might obstruct the action of the electroprovement in Electric-Arc Lamps, of whichmagnets.

In the drawings, Figure 1 is a vertical section illustrating my improvement. Fig. 2 is an inverted plan with the glass removed, and Fig. 3 is a sectional elevation of the devices for actuating the movable carbon holder.

The inverted base A is preferably made of a flat plate 2 and a circular rim 3 having a shoulderat etoreceive an india rubber or other elastic ring 5 between the shoulder of the base and the glass 13, and the glass is held in position and clamped to the rubber by any suitable device, such for instance as by the screws 6 so that the hanging glass can be easily and quickly removed to give access to the carbon holders and mechanism or replaced and rendered substantially air-tight against the rubber ring.

The carbon holders G O are stationary and connected to the inverted base and they conslotted and receivingthe sockets? for the carbons D, and I provide any suitable mechanism for causing the twocarbons in the pair of carbons to feed toward each other with uniformity, such for instance as a rod H and sliding tube G with a T-head G and links F to the carbon holders, as shown in the application, Serial No. 507,356, filed April 13, 1894:, by John E. Woolverton.

If desired, two pairs of carbons and carbon holders may be made use of. I have however represented a third carbon and holder K the upper end of which is connected with the plate L hinged at 15 to the under side of the inverted base A, so that the plate L and carbon holder K can be swung toward and from the carbons D for drawing the arc.

The helix of the electro-magnet' M is in the main circuit to the carbons, and the helix of be accessible and also free from the heat that may be developed within the inclosed space of the lamp, but in order to actuate the carbons by the core 0 of the helix M and O of the helix N, I make-use of tubes 9 and 10 of brass or other non-magnetic material passing through the plate 2 of the inverted base and extending sufficiently above the respective helices for the reception of the respective cores 0 and 0' and for allowing them to be moved endwise, and the upper ends of these tubes 9 and 10 are closed.

I have represented a stop cook 11 upon the upper end of the tube 10 which may be opened to allow the escape of gases that may accumulate within the lamp, and the cores 0 and O" are connected by the lever P pivoted at 8, and there is a branch lever B extending from the core 0' to the link or stud 12 that is connected with the hinged plate L, such lever R being pivoted at 13, and when a dash-pot is made use of, its piston is connected by a link 14 to one end of theleverP so as to prevent the movement of the parts being too rapid. It will now be understoodthat the length of the arc is regulated by the joint actionof the electro-magnets, and the carbons feed down in the form of an inverted pyramid, the light being at the apex, and for this reason I am enabled to make use of a hanging glass B having no central opening or support at thebottom, and hence there will not be any shadow cast downwardly, and in addition to the foregoing, I find that this construction of lamp allows for the glass remaining clear and free from carbonaceous deposits to a greater extent than in the lamps heretofore made use of, because any gases arising from the combustion of the carbon, pass up into the hollow inverted baseA and are condensed therein, and by this construction the hanging glass B can easily be separated from the lamp for washing and cleaning without disturbing any of the operative portions of said lamp, and there is no risk of the heat or the confined gases injuring the helices or theirinsulation,because such helices are entirely above the flat plate of the inverted base.

The binding screws 16 and 17 being upon the top of the inverted base A are in a convenient position for receiving the circuit wires, and the connections between the same and the respective helices and the carbon holders are made as shown in the drawings, and these connections are almost entirely outside of the base, and hence are easily accessible and at the same time protected from injury by heat.

I sometimes add an adjustable spring valve 18 opening outwardly to prevent any accumulation of pressure within the glass.

I claim as my invention 1. In an electric arc lamp, the combination with the hanging glass and the invertedbase, of carbons and carbon holders hanging downwardly from the base as an inverted pyramid, and means for feeding the carbons in one pair with uniformity, an electro-magnet' having a helix above the inverted base, a central tube connected at its lower end with the base, a core-within the tube, andlever connections to one of the carbon holders for regulating the electric are, substantially as set forth.

2. The combination with a hanging glass, an inverted base, and means for connecting the glass at its upper edge to the base, of carbon holders hanging as an inverted pyramid below the base, a main and a shunt helix above the base and supported by the same, tubes within the helices and closed at their upper ends and opening at their lower ends through the inverted base, cores within said tubes, and a lever mechanism connecting the cores and acting upon a movable carbon holder for drawing the electric are, substantially as set forth.

3. The combination in an electric arc lamp,

of an inverted base, a hanging glass secured at its upper edge to the base, stationary and movable carbon holders hanging as an inverted pyramid below the inverted base, a shunt and a main circuit helix above and resting upon the base and the binding post and connections above the base, tubes within the helices closed at the upper ends and opening through the base, cores within the tubes, a lever with which the cores are connected, and a branch lever and connection for moving one of the carbons and drawing the arc, substantially as set forth.

4. The combination in an electric arc lamp, of an inverted base and a hanging glass connected at its upper edge to the base, carbons and converging carbon holders connected to and hanging below the inverted base, means for feeding the carbons with uniformity in one pair of holders, and an electro-magnet and connections for acting on the other carbon in drawing the are, substantially as specified.

Signed by me this 13th day of June, 1894.

MAX MAYER.

\Vitnesses:

GEO. T. PINCKNEY, A. M. OLIVER. 

